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Add 21/15 and 63/28

1st number: 1 6/15, 2nd number: 2 7/28

21/15 + 63/28 is 73/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 28 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 15 × 28 = 420,
    21/15 = 21 × 28/15 × 28 = 588/420
  3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
    63/28 = 63 × 15/28 × 15 = 945/420
  4. Add the two like fractions:
    588/420 + 945/420 = 588 + 945/420 = 1533/420
  5. 1533/420 simplified gives 73/20
  6. So, 21/15 + 63/28 = 73/20
    In mixed form: 313/20

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